Improvement in ratchet-drills



2.Sheets-She'et 1.

l. M. KUEBEBLE.

Ratchet Drill.

Paten tedJuneQZ, I875.

Wiwses wflfi a -5y THE GRAPHIC COJHOTO LIYH. 39 8:4] PARK PLACE, N-Y.

UNITED STATES PATENT @FFIGE.

JOHN M. KOEBERLE, or PHILADELPHIA, rENNsYLvANrA.

IMPROVEMENT IN RATCHET-DRILLS.

Specification forming partof Letters Patent No. 164,686, dated June 22,1875; application filed February 19, 1875.

To all whom it may concern:

Be it known that I, JOHN M. KOEBERLE, of the city and county ofPhiladelphia, in the State of Pennsylvania, have invented an Improvement in Ratchet-Drills, of which the following is a specification:

My invention consists of a double-acting ratchet-drill, on which thestock has a continuous revolution by means of a double ratchet-wheel ona hub of the bit-stock, in combination with a hand-lever, whichoscillates on said hub, and has a jointed and geared connection with awheel above the ratchet-wheel insuch a manner that spring-pawlsconnected with the said lever and wheel, acting alternately on each sideof the ratchet-wheel, produce a continuous rotation of the bit-stock,and cause the drill to turn to the right in all movements of the lever.This arrangement requires the upper end of the stock to remainstationary. This is effected by means of a frog on its upper end, whichbites into any suitable support. The feed-screw has an adjustable nut,which bears against the lower end of the barrel. Beneath the nut thescrewstem is smooth, and turns in the hub of the drill-stock and partsattached. The end of the stem is conical, and turns in a correspondingdepression in the drill-stock.

In the accompanying drawings, Figure 1 is a side elevation of myimproved ratchet-drill. Fig. 2 is a horizontal section taken at the line00 w of Fig. 1. Fig. 3, Sheet No. 2, is a vertical section of the drill.Fig. 4 is an edge view of the frog" J. Fig. 5 is a face view of thewheel E, having an arm,f. Fig. 6 is a face view of the wheel D. Fig. 7is a crosssection at the line y g of Fig. 6. Fig. 8 is a face view ofthe ratchet-wheel F. Fig. 9 is an edge View of the same. Fig. 10 is aface view of the lever B.

Like letters of reference in all the figures indicate the same parts.

A is the bit-stock, which has a hub, ct, on

which the hub a of the lever B turns freely and which receives the stem11 on the lower end of the screw-rod O. The end of the stem is conical,and rests in the conical step c. D is a cog-wheel situated on the stem1), on which it turns freely, and rests on the hub a of the lever B.With this wheel the semi-wheel D of the lever B is geared, as seen moreclearly in Fig. 2. The outer end of the lever B is jointed to the leverB by means of the slot d and pin 6. E is a stationary ring on thestem 1) above the geared wheel D. It has an arm, f, which is jointed tothe semi-wheel D of the lever B by means of the pin 0. 7

By this connection of the levers B and B and wheels D l) and ring E itwill be seen that when the lever B is caused to oscillate back and forthon the hub a of the bit-stock the ring E remains stationary, and thatthehub a of the lever B will have a reciprocatin g movement around thehub a of the drill-stock, and said wheels D and D have a reciprocatingmovement in the same manner, the pin 0 changing its position accordinglyin the slot cl of the lever B. For the purpose of giving a continuousforward rotation to the bit-stock A its hub to is provided with aratchetwheel, F, which has teeth 9 on each side. The ratchet-wheel isfast on the hub to of the stock, and there is a pawl, G, in the recess hof the hub a of the lever B, which connects with the teeth on the underside of the ratchet-wheel, and a like pawl, G, in the recess h of thewheel D, which engages with the teeth in its upper side, so arrangedthat the two pawls act alternately on the ratchet-wheel as the lever Bis reciprocated, and thus impart a continuous rotation to the bit stockA. The pawls G and G are sprung into connection with the ratchet-wheel Fby means of the springs, as seen at i, in recesses of the hub a of thelever B and in the wheel D. The ratchetwheel may have the teeth on itsperiphery instead of on its face, as shown in the drawings, in whichcase the spring-pawls will be connected with the outside of the leverand wheel. I

On the screw-rod O is an adjustable feednut, H, which bears against thelower end of the barrel I, which has a central opening to receive thescrew-rod O. The upper end of the barrel is provided with a frog, J,which is caused to bite into any suitable support sufliciently toprevent the turning of the barrel as the bit-stock is rotated. By thealternate action of the pawlsG G upon the stationary ratchet-Wheel F thedrill-stock is always turned to the right, no matter in which directionthe lever B is turned.

I claim as my invention 1. In a ratchet-drill, the stationarybarrelstock I, provided with a frog, J, or equivalent device for holdingit in a fixed position, and a screw-rod, G, for the longitudinalmovement of the bit-stock, substantially as set forth.

2. The bit-stock A, having a double ratchv et-Wheel, F, in combinationwith the stationary barrel I and feed-screw rod 0, having an adjustablenut, H, substantially as and for the purpose set forth.

3. The combination of the levers B and B, Wheels D D, spring-pawls G G,and double ratchet-wheel F, for giving a continuous rotary movement tothe bit-stock A, substantially as set forth.

JOHN M. KOEBERLE, Witnesses:

THOMAS J. BEWLEY, STEPHEN Us'rIoK.

